diff --git a/CHANGELOG.md b/CHANGELOG.md
index 40f4580f7..a414ba5e0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - **Breaking:** `/api/pleroma/notifications/read` is moved to `/api/v1/pleroma/notifications/read` and now supports `max_id` and responds with Mastodon API entities.
 - Configuration: OpenGraph and TwitterCard providers enabled by default
 - Configuration: Filter.AnonymizeFilename added ability to retain file extension with custom text
+- Mastodon API: `pleroma.thread_muted` key in the Status entity
 - Federation: Return 403 errors when trying to request pages from a user's follower/following collections if they have `hide_followers`/`hide_follows` set
 - NodeInfo: Return `skipThreadContainment` in `metadata` for the `skip_thread_containment` option
 - NodeInfo: Return `mailerEnabled` in `metadata`
diff --git a/docs/api/differences_in_mastoapi_responses.md b/docs/api/differences_in_mastoapi_responses.md
index f34e3dd72..02f90f3e8 100644
--- a/docs/api/differences_in_mastoapi_responses.md
+++ b/docs/api/differences_in_mastoapi_responses.md
@@ -26,6 +26,7 @@ Has these additional fields under the `pleroma` object:
 - `content`: a map consisting of alternate representations of the `content` property with the key being it's mimetype. Currently the only alternate representation supported is `text/plain`
 - `spoiler_text`: a map consisting of alternate representations of the `spoiler_text` property with the key being it's mimetype. Currently the only alternate representation supported is `text/plain`
 - `expires_at`: a datetime (iso8601) that states when the post will expire (be deleted automatically), or empty if the post won't expire
+- `thread_muted`: true if the thread the post belongs to is muted
 
 ## Attachments
 
diff --git a/lib/pleroma/web/mastodon_api/views/status_view.ex b/lib/pleroma/web/mastodon_api/views/status_view.ex
index a4ee0b5dd..4c3c8c564 100644
--- a/lib/pleroma/web/mastodon_api/views/status_view.ex
+++ b/lib/pleroma/web/mastodon_api/views/status_view.ex
@@ -299,7 +299,8 @@ defmodule Pleroma.Web.MastodonAPI.StatusView do
         content: %{"text/plain" => content_plaintext},
         spoiler_text: %{"text/plain" => summary_plaintext},
         expires_at: expires_at,
-        direct_conversation_id: direct_conversation_id
+        direct_conversation_id: direct_conversation_id,
+        thread_muted: thread_muted?
       }
     }
   end
diff --git a/test/web/mastodon_api/views/status_view_test.exs b/test/web/mastodon_api/views/status_view_test.exs
index 1b6beb6d2..90451cbdc 100644
--- a/test/web/mastodon_api/views/status_view_test.exs
+++ b/test/web/mastodon_api/views/status_view_test.exs
@@ -150,7 +150,8 @@ defmodule Pleroma.Web.MastodonAPI.StatusViewTest do
         content: %{"text/plain" => HtmlSanitizeEx.strip_tags(object_data["content"])},
         spoiler_text: %{"text/plain" => HtmlSanitizeEx.strip_tags(object_data["summary"])},
         expires_at: nil,
-        direct_conversation_id: nil
+        direct_conversation_id: nil,
+        thread_muted: false
       }
     }
 
@@ -173,6 +174,24 @@ defmodule Pleroma.Web.MastodonAPI.StatusViewTest do
     assert status.muted == true
   end
 
+  test "tells if the message is thread muted" do
+    user = insert(:user)
+    other_user = insert(:user)
+
+    {:ok, user} = User.mute(user, other_user)
+
+    {:ok, activity} = CommonAPI.post(other_user, %{"status" => "test"})
+    status = StatusView.render("status.json", %{activity: activity, for: user})
+
+    assert status.pleroma.thread_muted == false
+
+    {:ok, activity} = CommonAPI.add_mute(user, activity)
+
+    status = StatusView.render("status.json", %{activity: activity, for: user})
+
+    assert status.pleroma.thread_muted == true
+  end
+
   test "tells if the status is bookmarked" do
     user = insert(:user)